Resource exhaustion in Kibana - CVE-2026-42399
Published: May 29, 2026
Vulnerability identifier: #VU132763
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-42399
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Elastic Stack
Affected software:
Kibana
Kibana
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the Timelion visualization expression parser when processing deeply chained function calls in a user-supplied Timelion visualization expression. A remote user can submit a specially crafted Timelion visualization expression to cause a denial of service.
Only deployments where authenticated users have access to the Timelion visualization feature are vulnerable.
How to mitigate CVE-2026-42399
Install security update from vendor's website.